/*

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
/*
 * Created on Apr 6, 2009
 */

package com.bigdata.counters.query;

import java.util.Iterator;
import java.util.Vector;
import java.util.regex.Pattern;

import com.bigdata.counters.CounterSet;
import com.bigdata.counters.ICounter;
import com.bigdata.counters.PeriodEnum;
import com.bigdata.counters.store.CounterSetBTree;

/**
 * Reads the relevant performance counter data from the store.
 * 
 * @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
 */
public class CounterSetBTreeSelector implements ICounterSelector {

//    private static final Logger log = Logger.getLogger(CounterSetBTreeSelector.class);
    
    private final CounterSetBTree btree;
    
    /**
     * 
     * @param btree
     *            The {@link CounterSetBTree}.
     */
    public CounterSetBTreeSelector(final CounterSetBTree btree) {
        
        if (btree == null)
            throw new IllegalStateException();

        this.btree = btree;
        
    }

    @Override
    @SuppressWarnings("rawtypes")
    public ICounter[] selectCounters(final int depth, final Pattern pattern,
            final long fromTime, final long toTime, final PeriodEnum period,
            final boolean historyRequiredIsIgnored) {

        final CounterSet counterSet = btree.rangeIterator(fromTime, toTime,
                period.toTimeUnit(), pattern, depth);

        // filter was already applied.
        final Iterator<ICounter> itr = counterSet
                .getCounters(null/* filter */);

        final Vector<ICounter> v = new Vector<ICounter>();

//        int ndistinct = 0;

        while (itr.hasNext()) {

            final ICounter c = itr.next();

//            if (depth != 0 && c.getDepth() > depth)
//                continue;
//
//            ndistinct++;
//
//            if (log.isDebugEnabled())
//                log.debug("Selected: ndistinct=" + ndistinct + " : " + c);

            v.add(c);

        }

//        if (log.isInfoEnabled())
//            log.info("Selected: ndistinct=" + ndistinct);

        return v.toArray(new ICounter[v.size()]);

    }

}
